<table class="table table-bordered" >
  <?php
  	$items = array(
  									"Willkommen"
  								,	"Datenbank"
  								,	"Administrator"
  								,	"Schule"
  								,	"Abschluss"
  								);
  	foreach($items as $index => $item){
  		$style = "";
  		if($index == $active_page){
  			$style = "background-color:#eee;";
  		}
  		echo '<tr><td style="' . $style . '">' . $item . '</td></tr>';
  	}
  ?>
</table>